American Indians in the Pacific by Norwegian archaeologist, ethnographer and historian Thor Heyerdahl. This book provides solid evidence of European presence in Pre-Columbian America.
I made this PDF yesterday from scanned image files. I left out blank pages to save space and reduce filesize. Still, the file is very big, over 111MB. This book have not been OCR'ed and is not searchable as of now. I just wanted this book to be easily available. Feel free to improve on the PDF to make it more user friendly.